Answer is YES. You can purchase all park tickets (except for Season Passes which are done near the main entrance)at the Soak City Entrance. You can also re-enter at any gate in the park. They simply stamp your hand. Tip for you: Purchase all your park tickets before the day(s)/times you plan on entering the park to avoid spending time waiting in lines. Also, another handy thing to remember is the gate near Oceana Stadium. If you're down on Southeastern Side near the main midway, and you need to go back to the hotel, use this exit. It's a straight shot up the boardwalk,and you'll save some time. For other tips check out Jeff's informative strategies section on this page or you can also e-mail myself especially with regards to Resorts Questions.
-Dave Kochman
Pittsburgh